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I ran into a wet pipe fire sprinkler system that has a small pressure pump installed on the riser.
The control valve and the alarm valve are dated 1957. Since this pump was installed and accepted, can it be removed or taken out if it's not working? I understand the pump was used to keep the alarm valve from opening during water pressure fluctuations to keep the false alarms from happening. Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
10 Comments
Alex
10/14/2021 07:08:36 am
HI Anonymous,
Clinton Summers
10/14/2021 09:31:09 am
If the date of install is 1957 then there should not be any calculations concerns unless the system was calculated after 1970s all systems before 70s we're pipe schedule systems
Jay
10/15/2021 12:57:29 pm
Systems prior to 1970 were hydraulically calculated as well. For example see the chapter for hydraulically calculated systems in the 1969 edition at nfpa.org/13.
Jesse
10/14/2021 08:09:54 am
It doesn't sound like the pressure pump is providing anything of material value to the hydraulic remote area, and I certainly doubt its listed. If all of that is the case, it can be removed.
Matt C
10/14/2021 08:11:37 am
Why not just replace it?
David Kendrick
10/14/2021 11:24:48 am
From my experience these excess pressure pumps were installed to keep the alarm seat firmly in place. When the system's pressure would get a surge the alarm valve's seat would lift and allow water to run into the alarm line and to the bell.
Franck
10/14/2021 11:47:49 am
As indicated by Alex and Jesse, there is no requirement for a Jockey pump downstream an ACV. So you can remove it, no issue.
Jack G
10/14/2021 12:03:34 pm
Probably an old ADP excess pressure pump, used for situations of " a lot of water use in the town, day time, ptessure low, then around 4-7 pm, pressure shoots up. We used to install an extra check back then, 50 s when we knew of situation. "
Mark Harris
10/20/2021 06:53:57 pm
Agree sounds like Albany or old ADT excess pressure pump. If the flow alarm has been updated over the years to a vane type waterflow switch with adjustable retard my no longer need. As others noted was designed to prevent false alarms on water surges. Somebody mentioned backflow preventer and at least for single wet riser systems the backflow requirements made alarm valves with pressure style flow switch and perhaps a water motor alarm gong uncommon.
Jeff edick
12/28/2023 03:51:49 pm
excess pressure pump helps keep old clapper seated. if there is only a retard chamber, the clapper will allow water to keep flowing into the chamber. old clappers have old gaskets that don't seat easily. Leave a Reply. |
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